2 files changed, 133 insertions, 0 deletions

diff --git a/lib/tsocket/tsocket.h b/lib/tsocket/tsocket.h
index 7987571bc3..4445aafe9d 100644
--- a/lib/tsocket/tsocket.h
+++ b/lib/tsocket/tsocket.h
@@ -179,5 +179,13 @@ struct tevent_req *tsocket_sendto_send(struct tsocket_context *sock,
 				       const struct tsocket_address *dst);
 ssize_t tsocket_sendto_recv(struct tevent_req *req, int *perrno);
 
+struct tevent_req *tsocket_sendto_queue_send(TALLOC_CTX *mem_ctx,
+					     struct tsocket_context *sock,
+					     struct tevent_queue *queue,
+					     const uint8_t *buf,
+					     size_t len,
+					     struct tsocket_address *dst);
+ssize_t tsocket_sendto_queue_recv(struct tevent_req *req, int *perrno);
+
 #endif /* _TSOCKET_H */
 
diff --git a/lib/tsocket/tsocket_sendto.c b/lib/tsocket/tsocket_sendto.c
index 9486374d26..4531c40321 100644
--- a/lib/tsocket/tsocket_sendto.c
+++ b/lib/tsocket/tsocket_sendto.c
@@ -134,3 +134,128 @@ ssize_t tsocket_sendto_recv(struct tevent_req *req, int *perrno)
 	tevent_req_received(req);
 	return ret;
 }
+
+struct tsocket_sendto_queue_state {
+	/* this structs are owned by the caller */
+	struct {
+		struct tsocket_context *sock;
+		const uint8_t *buf;
+		size_t len;
+		const struct tsocket_address *dst;
+	} caller;
+	ssize_t ret;
+};
+
+static void tsocket_sendto_queue_trigger(struct tevent_req *req,
+					 void *private_data);
+static void tsocket_sendto_queue_done(struct tevent_req *subreq);
+
+/**
+ * @brief Queue a dgram blob for sending through the socket
+ * @param[in] mem_ctx	The memory context for the result
+ * @param[in] sock	The socket to send the message buffer
+ * @param[in] queue	The existing dgram queue
+ * @param[in] buf	The message buffer
+ * @param[in] len	The message length
+ * @param[in] dst	The destination socket address
+ * @retval		The async request handle
+ *
+ * This function queues a blob for sending to destination through an existing
+ * dgram socket. The async callback is triggered when the whole blob is
+ * delivered to the underlying system socket.
+ *
+ * The caller needs to make sure that all non-scalar input parameters hang
+ * arround for the whole lifetime of the request.
+ */
+struct tevent_req *tsocket_sendto_queue_send(TALLOC_CTX *mem_ctx,
+					     struct tsocket_context *sock,
+					     struct tevent_queue *queue,
+					     const uint8_t *buf,
+					     size_t len,
+					     struct tsocket_address *dst)
+{
+	struct tevent_req *req;
+	struct tsocket_sendto_queue_state *state;
+	bool ok;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct tsocket_sendto_queue_state);
+	if (!req) {
+		return NULL;
+	}
+
+	state->caller.sock	= sock;
+	state->caller.buf	= buf;
+	state->caller.len	= len;
+	state->caller.dst	= dst;
+	state->ret		= -1;
+
+	ok = tevent_queue_add(queue,
+			      sock->event.ctx,
+			      req,
+			      tsocket_sendto_queue_trigger,
+			      NULL);
+	if (!ok) {
+		tevent_req_nomem(NULL, req);
+		goto post;
+	}
+
+	return req;
+
+ post:
+	return tevent_req_post(req, sock->event.ctx);
+}
+
+static void tsocket_sendto_queue_trigger(struct tevent_req *req,
+					 void *private_data)
+{
+	struct tsocket_sendto_queue_state *state = tevent_req_data(req,
+					struct tsocket_sendto_queue_state);
+	struct tevent_req *subreq;
+
+	subreq = tsocket_sendto_send(state->caller.sock,
+				     state,
+				     state->caller.buf,
+				     state->caller.len,
+				     state->caller.dst);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, tsocket_sendto_queue_done ,req);
+}
+
+static void tsocket_sendto_queue_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(subreq,
+				 struct tevent_req);
+	struct tsocket_sendto_queue_state *state = tevent_req_data(req,
+					struct tsocket_sendto_queue_state);
+	ssize_t ret;
+	int sys_errno;
+
+	ret = tsocket_sendto_recv(subreq, &sys_errno);
+	talloc_free(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, sys_errno);
+		return;
+	}
+	state->ret = ret;
+
+	tevent_req_done(req);
+}
+
+ssize_t tsocket_sendto_queue_recv(struct tevent_req *req, int *perrno)
+{
+	struct tsocket_sendto_queue_state *state = tevent_req_data(req,
+					struct tsocket_sendto_queue_state);
+	ssize_t ret;
+
+	ret = tsocket_simple_int_recv(req, perrno);
+	if (ret == 0) {
+		ret = state->ret;
+	}
+
+	tevent_req_received(req);
+	return ret;
+}
+